<template>
  <div class='home-category' @mouseleave="(categoryId = null)">
    <ul class="menu">
      <!-- 这里鼠标经过事件和点击事件一样可以把当前的数据传入进去 -->
      <li :class="{active:item.id === categoryId}" v-for="item in menuList" :key="item.id" @mouseenter="(categoryId = item.id)">
        <RouterLink :to="`/category/${item.id}`">{{ item.name }}</RouterLink>
        <template v-if="item.children">
          <RouterLink v-for="sub in item.children" :key="sub.id" :to="`/category/sub/${sub.id}`">{{ sub.name }}
          </RouterLink>
        </template>
        <template v-else>
          <XtxSkeleton style="margin-right: 5px;" width="60px" height="18px" bg="rgba(255,255,255,0.2)"/>
          <XtxSkeleton width="50px" height="18px" bg="rgba(255,255,255,0.2)"/>
        </template>
      </li>
    </ul>
    <!-- 弹层 -->
    <div class="layer">
      <h4>{{currCategory && currCategory.goods?'分类推荐':'品牌推荐'}} <small>根据您的购买或浏览记录推荐</small></h4>
      <!-- 商品 -->
      <ul v-if="(currCategory && currCategory.goods)">
        <li v-for="item in currCategory.goods" :key="item.id">
          <RouterLink :to="`/product/${item.id}`">
            <img v-lazy="item.picture" alt="">
            <div class="info">
              <p class="name ellipsis-2">{{ item.name }}</p>
              <p class="desc ellipsis">{{ item.desc }}</p>
              <p class="price"><i>¥</i>{{ item.price }}</p>
            </div>
          </RouterLink>
        </li>
      </ul>
      <!-- 品牌 -->
      <ul v-if="(currCategory && currCategory.brands)">
        <li class="brand" v-for="brand in currCategory.brands" :key="brand.id">
          <RouterLink to="/">
            <img v-lazy="brand.picture" alt="">
            <div class="info">
              <p class="place"><i class="iconfont icon-dingwei"></i>{{brand.place}}</p>
              <p class="name ellipsis">{{brand.name}}</p>
              <p class="desc ellipsis-2">{{brand.desc}}</p>
            </div>
          </RouterLink>
        </li>
      </ul>
    </div>
  </div>
</template>

<script setup>
import { useStore } from 'vuex'
import { findBrand } from '@/api/home'
import XtxSkeleton from '@/components/library/xtx-skeleton.vue'

// 最终数据是vuex数据+1条自定义
const store = useStore()
// 定义品牌数据
const brand = reactive({
  id: 'brand',
  name: '品牌',
  children: [{
    id: 'brand-children',
    name: '品牌推荐'
  }],
  brands: [] // 追加品牌数据
})
const menuList = computed(() => {
  // 获得分类的前2个子分类
  const list = store.state.category.list.map(item => {
    return {
      id: item.id,
      name: item.name,
      // 默认值没有children
      children: item.children && item.children.slice(0, 2),
      goods: item.goods
    }
  })
  list.push(brand)
  return list
})
// 得到弹层渲染数据
const categoryId = ref(null) // 父级分类的id
// 获得当前分类数据
const currCategory = computed(() => menuList.value.find((item) => item.id === categoryId.value))
// 获取品牌数据,setup语法糖内可以直接使用await,但是setup让整个组件变成了异步组件，在父组件中引入该组件前需使用suspense

findBrand().then(data => {
  brand.brands = data.result
})

</script>

<style scoped lang='less'>
.home-category {
  width: 250px;
  height: 500px;
  background: rgba(0, 0, 0, 0.8);
  position: relative;
  z-index: 99;

  .menu {
    li {
      padding-left: 40px;
      height: 50px;
      line-height: 50px;

      &:hover,&.active {
        background: @xtxColor;
      }

      a {
        margin-right: 4px;
        color: #fff;

        &:first-child {
          font-size: 16px;
        }
      }
    }
  }

  .layer {
    width: 990px;
    height: 500px;
    background: rgba(255, 255, 255, 0.8);
    position: absolute;
    left: 250px;
    top: 0;
    display: none;
    padding: 0 15px;

    h4 {
      font-size: 20px;
      font-weight: normal;
      line-height: 80px;

      small {
        font-size: 16px;
        color: #666;
      }
    }

    ul {
      display: flex;
      flex-wrap: wrap;

      li.brand {
        height: 180px;

        a {
          align-items: flex-start;

          img {
            width: 120px;
            height: 160px;
          }

          .info {
            p {
              margin-top: 8px;
            }

            .place {
              color: #999;
            }
          }
        }
      }

      li {
        width: 310px;
        height: 120px;
        margin-right: 15px;
        margin-bottom: 15px;
        border: 1px solid #eee;
        border-radius: 4px;
        background: #fff;

        &:nth-child(3n) {
          margin-right: 0;
        }

        a {
          display: flex;
          width: 100%;
          height: 100%;
          align-items: center;
          padding: 10px;

          &:hover {
            background: #e3f9f4;
          }

          img {
            width: 95px;
            height: 95px;
          }

          .info {
            padding-left: 10px;
            line-height: 24px;
            width: 190px;

            .name {
              font-size: 16px;
              color: #666;
            }

            .desc {
              color: #999;
            }

            .price {
              font-size: 22px;
              color: @priceColor;

              i {
                font-size: 16px;
              }
            }
          }
        }
      }
    }
  }

  &:hover {
    .layer {
      display: block;
    }
  }
}
.xtx-skeleton {
  animation: fade 1s linear infinite alternate;
}
@keyframes fade {
  from {
    opacity: 0.2;
  }
  to {
    opacity: 1;
  }
}
</style>
